The Ohio Child Support Calculator will provide an estimate of the support obligations that may be included in a court or administrative child support order. Ohio Child Support Calculator - Guidelines Calculator.Does Ohio Have an Alimony Calculator? However, the following calculator provides an estimate of a potential alimony award in the State of Ohio. No formula under Ohio law specifies how spousal support is calculated. (However, some courts offer guidelines that will at least get you in a ballpark.) Welcome to the Child Support Guideline Manual for Ohio. The goal of this video is to do a spousal support calculation quickly and professionally so that you'll be better able to evaluate your client's interests. In Ohio, the state uses a pre-set formula to calculate child support obligations. Family law courts will only deviate from the formula in narrow circumstances.